Well, I would say structure data is just a term like a website which can be developed in HTML same way Structure data can be also implemented in Schema markup (Vocabulary).
Schema markup code can be written in three different languages:
Microdata (Lot of headache in order to implement structure data in this from a design perspective)
Json-ld (Google recommends this. No headache at all. Prefer GTM for implementation)
RDFA (Deprecated)
While rich snippet and rich cards are outcomes of structure data like
Rich snippet example:
Breadcrumbs
Review Rating
Reviews
Products
Recipe
Videos
Music
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